[dm-devel] [PATCH 05/26] dm raid: more restricting data_offset value checks

[heinzm at redhat.com]

From: Heinz Mauelshagen <heinzm at redhat.com>

Signed-off-by: Heinz Mauelshagen <heinzm at redhat.com>
---
 drivers/md/dm-raid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index a382985..b1dbf28 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -1221,7 +1221,8 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
 				return -EINVAL;
 			}
 			/* Ensure sensible data offset */
-			if (value < 0) {
+			if (value < 0 ||
+			    (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) {
 				rs->ti->error = "Bogus data_offset value";
 				return -EINVAL;
 			}
-- 
2.5.5